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People wont laugh man, toughen the fuck up and go for it. I'm only 20 myself and the idea doesn't bother me, as long as you keep it cool and make it come across as a general like, rather than some fanboy who doesn't take care of himself and gushes over it, you'll be fine, you wont run into problems.
At most i've had one guy make a comment behind my back when I got Y but when I confronted him on it, he backed off like a coward. It probably helps i'm about 6'1" and swim a lot so I look pretty buff and that he was about 17.